Safety factors for anterior pedicle screw fixation tunnel in axis

VernacularTitle:枢椎前路椎弓根螺钉固定通道的安全因素分析
Author: Yongjie GU ; Yong HU ; Rongming XU ; Weihu MA ; Qun HUA ; Hongyong ZHAO
Publication Type:Journal Article
Keywords: Axis; Anatomy; Pedicle screw
From: Chinese Journal of Trauma 2011;27(2):125-127
CountryChina
Language:Chinese
Abstract: Objective To investigate feasibility and safety of anterior pedicle screw fixation tunnel in the axis so as to provide theoretic evidence for further clinical application.Methods Thirty-two dry axis specimens were used for anterior pedicle screw placement,and the length of pedicle crews tunnel was measured by a digital caliper.The extraversion angle and the downslope angle were determined by CT cross-sectional scanning and reconstruction.Results All the anterior pedicle screws were positioned well,with no perforation of the pedicle.The anchoring point was at the vertex between the vertebral body and the superior articular process,with axis pedicle length of(28.4 ± 2.5)mm,the extraversion angle of (28.5 ±2.3)°and the downslope angle of(15.5 ±2.0)°.Conclusions Anterior pedicle screw fixation tunnel is feasible in the axis and can keep away from some important anatomy structures including transverse foramen,vertebral artery groove and vertebral canal to provide large safety space.